Many people already know about the Anime, Manga, and Cosplay culture of Japan.
They are greatly popular among not just Japanese teens, but also China and Korea.

This culture has spread so widely, that it is almost all over the world, now.

Cosplay Culture

Cosplay is a mixed word for Costume Play.
It basically means to copy a character, most likely of one from mangas or animes, to dress up as and share with others.
Cosplay in Japan became so big that Hollywood stars, such as Gwen Stefani (with Harajuku Girls) and Kanye West, have been influenced by this art.

Main areas of Japan with famous and one of the best Cosplays include:

Tokyo's Akihabara District

-There are great amount of the Cosplay Cafes, such as maid cafes or Anime character cafes.
These cafes are so popular that often times there are long lines just to enter the cafe.

and

Tokyo's Harajuku District

-Every Sunday at the Jingu bridge there is a gathering of Cosplay fans.
Thousands of people attend to show off and share each others Cosplay outfits.

Anime & Manga

Anime: Comics or cartoon in video.
Manga: Comics or cartoon in books. (a.k.a. Comic books)

Japanese Anime and Manga has become so famous that tremendous amount of works have been spread all over the world, mainly Korea or Japan.
These works also have been published as J-Dramas (Japanese) and even K-Dramas or C-Dramas (Korea and China).

One of the most popular work is "Hana Yori Dango" or "Boys Over Flowers" (Created into Korean, Japanese, and Chinese Drama)